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(No Model.)

, J'. -MAHONY.

STEAM BOILEB. FURNAGE.

Patented Junel3, .1882..Y

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UNTTBD STATES ATTLNT Trice.

JAMES MAHONY, OF NEW YORK, N. Y.

STEAM-BOILER FURNACE.

SPECIFICATION forming part of Letters Patent No. 259,325, dated June 13, 1882.

Application filed December 29, 1881. (No model.)

To allwhomitmay concern: and receives its air and steam through pas- Be it known that I, JAMES MAIIONY, of sagesin the ordinary nre-bridge, (marked U.) New York city, in the county and State of New The other is mounted on and will be under- York, have invented certain new and useful stood to similarly receive its hot air and steam 55 5 Improvements relating to Steam-Boiler Furthrough passages in a second bridge or corre- Ilaces, of which the following is a specification. spending wall located in rear of the first. A The object of the invention is to promote the considerable space is allowed forY the circulacomplete combustion of the fuel and of the tion of the hot gases between the tire-bridge gaseous products emanating therefrom by the proper andthe second bridge or corresponding 6o 1o judicious introduction of steam and ot' atlow wall of masonry, C. There is alsoa space mospheric air at a high temperature. I have for the gases to circulate in rear'of the second devised efficient and convenienily-controllable bridge, C', and between that and the extreme means for attaining these ends. rear of the furnace.

The following is a description of what I con- The transverse tubes and passages through 65 I5 Sider the best means of carrying out the inwhich the hot air and steam, are received are vention. marked E. Steam at full pressure is taken' The accompanying drawings form a part of from the upper portion ofthe boiler through a this specification. pipe, c, controlled by a valve, c', and is injected Figure l is a central longitudinal vertical through a contracted nozzle into thepipeEin 7o 2o section. Fig. 2 is a front elevation, partly in the manner shown in Fig. 2. The force of this crosssection. The section is on the line s s jet of strong steam is expended in blowing or in Fig. l. Fig. 3 is a horizontal section on the forcibly moving along the air and causingit to line t tin Fig. l. be discharged with the small increment of Similarlettersot'referenceindicatelilic parts steam thus received into the gases. The air 75 25 in all the figures. thus received is not cold air from the outside, A* is the brick-work or other substantial butisraised in temperature by being caused to material which constitutes the inclosing walls traverse through a passage or air-space, a, or masonry of the furnace. formed in the walls or masonry of the furnace.

The boiler A is represented as of that class This passage extends along three sides ofthe Sq 3o in which the shell is a plane cylinder, the heat furnace, as plainly shown in Fig. 3. The air is being applied to the contained water through inducted at the point c through registers, the shell from the outside, and also through a which may be opened more or less by the atseries of small tubes which traverse the boiler tendant or by automatic devices not shown. longitudinally. The exhaust products of com- The effect of closing both these registers is to 85 3 5 bustion generated from the fuel on the grateB entirely shut oft' the induction of air through y* traverse backward under the shell, rise at the the perforatious in the shells M. The steam back, and then traverse forward through the from the pipe e should be usually shut off at tubes, rising after their escape from the front the same time by closing the valve e. By ends of the tubes, and iiowin g away through opening and closing the registers at a and the 9o 4o a suitable uptake and chimney. (Not represteam-valve e' more or less, the conditions may sented.) be varied within wide limits. The induction M M, Ste., are a series of hollow spheroidal ot' sufficient air through this space a exercises shells, perforated, and connected by passages a slight cooling influence on the masonry Ait. below with channels, through which air is re- I esteem this rather an advantage than other- 9 5 4 5 ceived at a considerably-elevated temperature. wise. The coolin g is not so great as to materi- Itis discharged, mingled with a small quanally change the temperature of the inner walls tity of steam, through the perforations in the ot' the brick-work-that which is presented toshells, and is favorably conditioned to comward the furnace. My furnace involves the bine with the unconsumed gases flowing over advantage that its walls become heated and roe 5o and between them. I propose to employ two reflect heat upon the boiler-shell in the same series of such shells M.. One is mounted on manner as ordinary solid brick walls.

A represents openings from the air-space a into the sides of the ash-pit. These allow a limited circulation between these important members ofthe apparatus. NVhen there is a surplus of hot air in the space a, it can flow through the apertures A directly into the ashpit, and thus supply Warm air to the latter. The elevation ot' temperature by this means promotes economy of combustion. The conditions prevent the lise from ever being so high as to endanger the melting of the grate.

Aseries of tubes, P, extend horizontally from the back of the furnace to the`ash-pit, traversing on its way the space referred to behind the re-bridgeC and behind the second wall or bridge, G. A register, P', controls the induction of air through these pipes. A steampipe,p, leading from the upper portion of the boiler, and controlled by a valve, p', supplies zo jets of steam properly conditioned to force the air rapidly through these pipes. The air is heated by the gases flowing from the furnace and circulating more or less downward in the spaces providedarouud the pipes P. A series of small orifices, p2, are provided in the upper sides of the pipes P, through which the hot air, mingled with a small quantity of steam re-, ceived from the blowing jet, tlows out and mingles with the gases. This further promotes combustion of the gases. Provisions may be -made for partially or entirely closing these holes at will, it" desired. I prefer to employ them, as shown, always open, but to make them of such diameter that but little air is thus delivered. The air escapes more freely into the combustiouchamber than under the grate by reason of the partial vacuum induced by the draft in thecombustion-chamber. When the register P is nearly closed all the air will tlow out through the apertures p2,- but when the register is liberally opened much of the hot air received through the pipes P is delivered into the ash-pit. It rises through the grates and supplies hot air for the support of the combustion at that point. 'The warming ot' the air in this manner is sut'tcient to materially promote economy without under any conditions melting down the grate.

The registers P may be all connected together and operated asa unit. The attendant, by opening and closing this registerv and the valve 1J', can graduate the quantity ot air and steam received through the pipe P.

Modifications may be made in the forms and proportions within wide limits.

I can vary the forms and kinds of boiler indefinitely. Twoormoreshellsmaybemounted side by side in a single furnace.

The registers P at the back may be united into a single slide with transverse openings, coinciding or not with corresponding openings in the fixed plate. I have shown them as ordinary revolving registers having radial openings which correspondingly coincide. The arrangementallowsthe deliveryofhotairthrough one or more of the pipes P, and blowing the same by steam through one or more ofthe pipes p without the rest. employed to control all the pipes P, I can em ploy a single pipe, p, and a single controllingvalve, p', properly branched to blow with the proper number ot jets corresponding to the number of pipes P.

' Parts of the invention may be used with advantage without the whole.A

I claim as my invention- 1. The tubes P, extendinginto theash-pit, and having perforationsp, register P', live-steam pipe p, and valve p', combined as shown, and arranged to deliver air and steam in controllable quantities into the combustion-chamber in small jets, with the certainty that the surplus beyond what is drawn thus divided into the combustion-chamber will be delivered into the ash-pit under the grate, all substantially as herein specified.

2. The combination ofthe masonryAl'ihaving the airspace a, and the openings Al into the asl1-pir,the two dre-bridges C C,each with the shells M, connections for delivering hot air and steam thereimand the perforated pipes P192, with the steam-blowers and controlling means, arranged for joint operation relatively to each other and to the grate B and boiler A as herein specified.

In testimony whereof I have hereunto set my hand, at New York city, this 24th day of December, 1881., in the presence ot two subscribing witnesses.

JAMES MAHONY.

Witnesses:

S. F. MAHONY, CHARLES C. S'rErsoN.

Then a single register is 

